Shares of Hero MotoCorp came under free fall after the Income Tax department conducted raids and searches at various premises of Hero MotoCorp as part of tax evasion investigation against the country's largest two-wheeler manufacturer, officials said Wednesday morning. Hero MotoCorp shares fell as much as 3.81 per cent to hit an intraday low of Rs 2,328.85 on the BSE. Its premium on Rs 2,400 strike price put option surged by 200 per cent at the day's lowest level, data from the National Stock Exchange showed.